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Proceedings Paper

Laser beam focusing through the scattering medium using bimorph deformable mirror and spatial light modulator
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Paper Abstract

Bimorph deformable mirror with the clear aperture of 50 mm and 48 control electrodes and spatial light modulator with resolution of 1920x1080 pixels were used to increase the efficiency of focusing of partially coherent laser radiation, propagated through the 5 mm layer of the scattering suspension of 1 um polystyrene microspheres, diluted in distilled water, with the concentration values ranging from 105 to 106 mm-3. Medium with such parameters can be considered as an equivalent to the mid-dense fog layer with the length ranging from 300–500 meters up to 5 kilometers. Shack- Hartmann sensor was used to measure the distortions of averaged wavefront of laser beam, and CCD camera was used to estimate the intensity distribution of the focal spot in the far-field. Numerical and experimental investigation of the focusing improvement showed that it is possible to increase the peak intensity of the focal spot up to 45–60 %.

Paper Details

Date Published: 6 September 2019
PDF: 11 pages
Proc. SPIE 11135, Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2019, 111350B (6 September 2019);
Show Author Affiliations
Ilya Galaktionov, Institute of Geosphere Dynamics (Russian Federation)
Active Optics NightN Ltd. (Russian Federation)
Alexis Kudryashov, Institute of Geosphere Dynamics (Russian Federation)
Active Optics NightN Ltd. (Russian Federation)
Moscow Polytech (Russian Federation)
Julia Sheldakova, Institute of Geosphere Dynamics (Russian Federation)
Moscow Polytech (Russian Federation)
Alexander Nikitin, Institute of Geosphere Dynamics (Russian Federation)
Active Optics NightN Ltd. (Russian Federation)


Published in SPIE Proceedings Vol. 11135:
Unconventional and Indirect Imaging, Image Reconstruction, and Wavefront Sensing 2019
Jean J. Dolne; Mark F. Spencer; Markus E. Testorf, Editor(s)

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